Wire brush



June 21,1927; I 1 ,633,274

G. RASMESEN, JR

WIRE BRUSH Filed March e. 1925 Patented June 21, 1927.

GEORGE msnesm-m, onwmn n'rka, ILLINOIS;

WIRE 'BRUSH.

Application filed March a, 1925; keratin-"13,540:

This invention relates tothetufts'and a methodof forming tufts forwire'bri'i'shes, and to the construction of-"rotary powe'rdriven wirebrushes. A purposefo'f the in-'- 5 vention'is to providee simple methodof forming the tufts and to provide anarr'ang'e ment whereby more wiremaybe used-"1n a brush "of given dimensions than has *been possible withsome brushes now commonlyin use; to provide a form" of tuft which may"be made more 'or' less unyielding or flexible with any given gage ofwlre; to proV1de"a"w1re wheel-brush which *will stand unusuallyhigh 7speed in'itsoper'ation and all necessary pres sure aga nst the surfaceoperated upo'n without-resulting in 'weakenl'ng and' "breakln'g thewire-forming thebrush'; to provide a brush "which, while permitting theuse of 'a large amount of wire therein, will=still allow" for ample aircirculation and for the proper clearing of the wire bristles of matterout from the surfaces operated upon; and to provide abrush in which,even though 'exceedinglynine wire is used 'in forming the tufts, thesame may "nevertheless be made form"ofahelicalspring. Each of said'priorvery rigid or resistant to being flexedeutof radial position.Anotherpurpose of the inrespects;and}partic ularly when subjected 'to'usageh Applicant now proposes a ''very' carefully made"brush,intending"to vention is to avoid the necessity of weaken ing the wire bristles bysubjectingthem[to' undue strain or sharp bends in the fo min operationand to provide a brush which will not change its form or materially itsdi-'' ameter under continued use.-

The drawing shows the appearance of one i complete section of the brushand in'dlvl'dual tufts thereof and diagrammatic views show:

ing the method of forming th tuft Of thedrawing-* Figure 1 is a faceview of one disk shaped SBC DiOIYfOI'I IIIIIg a complete brnsh, but as arule, a plurality 'of such sect1onsiaremount-"- The diagrammatic viewsillustrate the method of forming the individual tufts mak ing up the'brush and also the appearance of I the completed tuft. It is customaryin t-he manufacture of power brushes to mount the tufts on a pluralityof coaxial washer-shaped supports, these supports having holes neartheir peripheries through which the tufts are passed in the form ofstraight or crimped selves'to eXtencPmore'on-less radially from thesupports", '"orthe tuft'may in additioir be 'twist'edupon" itself. Inthe present method ofconstruction'a"group of parallefwires arepassed'throug'h an aperture in thesup'port-- ing -"plate* and then arebentbut'wardly "to" extend radially of the support}, butthe bendingiscontinued'in the' same direction at a I -'point?outvi ardly of the edgeof the support so thatat-thi's point the two halves ofthe tuftcrosseach" other, then" each half; ofthe tuft without being permanentlybent [is turned f ='ba' ckwardly beyond the radial position s read a artfan-wise" opposite the f remaining half and then released so that eachhalf of the tu'ft' springsto the position to which it was originallybent, but with the in d iv-idual wires separatedand passing between thewires'ofthe opposite half.

Wire brushes of the general class to which thi's invention relates areusually provided with eithermoreor less radially extending bristles, orbristles which are'crimp'ed along theirlength or'twisted more or' lessin the utilize the wire thereof to; its maximum capacityL 'It -isal'sothe intention'toaccomplish with tlie present design of brush the 'fine"workwliicli' mayonly be done with a brush formed of finer wire,butnevertheless'toj mal'ie such a brush high'ly resistant to radialpressure"ancl "the' impact'due'to its rotationat high s eed? Therefore,each of the bristles forming the'brus'lfis'bent-at adefinite point insuch a way that the'bristlesintersect at this point and support oneanother against radial pres sure' to any desired degree, depending uponthe numbe'r' of and" location of such intersecting points. "lVith thisend in view, the

illustration"shows a typical but simplified formof the brushi -T hetufts are formedon a washer-shaped permanent holder therefo'r,- such'as'the perforated disk 1; This disk hasa '=centra'l""'aperture 2 throughwhich passes-a supportingspindle ;upon which a luralityof the brushsections "may be mounted. Near its periphery, disk 1 is provided with apluralityof circular holes 3 for receiving the tufts. In forming thetufts, a

group of parallel wires 4 are passed through I one of the apertures 3,and preferably sufficient in number to substantially fill such anaperture, and are then bent into U form, .as illustrated in Fig. 2. Ablock or split ring 5 is then placed upon the periphery of the disksupport 1, in order to facilitate further bending of the wires 4 at thedesired location. The opposite arms of the tuft are then bent in a groupacross the outer edge of the member 5, so that the ends thereof extendin substantially the angle 4, illustrated in Fig. 3. Then anotherforming ring or block 6 is placed above the crossed ends of the wiretufts and these ends are then bent upwardly to the position indicated bythe dotted lines, r. The forms 5 and 6 are then removed, leaving onegroup of bristles of each tuft crossing as a unit the opposite group of-bristles, Figure 4, at the point 7 Next each group of bristles isresiliently drawn backward so as to no longer cross the opposite groupof bristles, coming to the position indicated in Fig. 5.

Each group of bristles in the arms 8 and 9 of the tuft are then fannedout or spread into planes, extending in the same general direction asthe plane of disk 1. The two halves of the tuft are then released sothat the individual bristles of the first half intersect or intermeshwith the bristles of the opposite half, as indicated at 10 in Fig. 1.The bristles, therefore, at this point of intersection come into a moreor less compact mass, the resilience of the bristles at their outer endsbeing dependent upon the distance of this point of intersection of-thebristles from the outer end of the tuft and also upon the number of suchintersections. The above described operation may be repeated so that thecompleted tuft may be provided with a plurality of such intersectingbristle supporting points between its ends. Thus it is contemplated torepeat the bending process at different points throughout the length ofeach tuft according to the rigidity re-' quired.

In the use of a brush, such as described, assuming that a plurality ofthe units shown in Fig. 1 are clamped together on a common spindle, thedisplacements of the tufts under operating strains in a directionparallel with the axis, is resisted by the clamping devices at the endsof the brush and by one tuft bearing against another, but the radialpressure on the ends of the bristles, when the brush is doing heavywork, may be counteracted by the entire mass of bristles of each tuft atthe points of intersection thereof. By arranging just one of saidintersecting points, as illustrated in Fig. 1, at considerable distancesfrom the periphery of the brush, the brush is, of course, far moreresilient than is the case when there are a plurality of theseintersecting points, particularly when there is one close to theperiphery of the brush.

My means of this system of manufacturing wire brushes and theconstruction thereof, it is possibleto employ a comparatively large massof extremely fine bristles in a brush of any given dimensions, whilestill having such brush highly resistant to pres sure and the individualdisplacementof its bristles, and avoid the mere dragging of the bristlesover the surface operated upon without utilizing to full advantage theircutting edges, irrespective of operating the brush under high speed andconsiderable pressure.

Although but one specific embodiment of this invention has been hereinshown and described, it will be understood that numerous details of theconstruction shown may be altered or omitted without departing from thespirit of this invention as defined by the following claims.

I claim:

1. The method of forming tufts for resilient wire brushes which consistsin bending a group of parallel wires into U form and then at a pointbetween the ends of the U bending each leg thereof to cross the oppositeleg, then drawing each leg of the tuft away from the opposite one andspreading the wires thereof apart and allowing the same to springtogether and cross between each other near the points of the bends.

2. The method of forming tufts for resilient wire brushes which consistsin bending a group of parallel wires into U form'and then at a pointbetween the ends of the U bending each leg thereof to cross the oppositeleg, and then at a point outward of said bend, again bending the wiresto extend more or less parallel, then drawing each leg of the tuft awayfrom the opposite one and spreading the wires thereof apart and allowingthe same to spring together and cross each other between the points ofthe bends.

3. A wire tuft formed into two legs, the individual bristles of each legcrossing and intermeshing with the bristles of the opposite leg at adefinite point between the ends of the tuft and beyond said point againbeing bent to extend in the same general direction.

I Signed at Winnetka this 28th day of Feby 1925.

- GEORGE RASMESEN, JR.

